bibliothecarial vs bibliothecal

bibliothecarial and bibliothecal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
bibliothecarial	No	Yes	No	No
bibliothecal	No	Yes	No	No

As adjectives, bibliothecarial and bibliothecal are synonyms defined as:

bibliothecarial and bibliothecal: of or relating to a library or bibliotheca or a librarian

bibliothecarial (adjective)	bibliothecal (adjective)
of or relating to a library or bibliotheca or a librarian	of or relating to a library or bibliotheca or a librarian